Secret Love Will Never Come True

The heroine and the hero are childhood sweethearts, and the heroine has been secretly in love with the hero for 15 years. The heroine later found out that she didn't have long to live. She was suffering from leukemia and was dying. When the second hero found out, he went to accompany the heroine. The female protagonist and the male protagonist actually liked each other, but the male protagonist thought that the female protagonist liked the second male protagonist, and both parties missed each other.